Department of Electrical Engineering & Computer Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA.
Opt Lett. 2011 Sep 15;36(18):3596-8. doi: 10.1364/OL.36.003596.
We present a method for ultra-low-loss coupling between two single-mode optical fibers with different mode-field diameters using multimode interference in a graded-index multimode optical fiber. We perform a detailed analysis of the interference effects and show that the graded-index fiber can also be used as a beam expander or condenser. The results are important for devices in which optical fibers with different mode-field diameters are coupled in series, such as in ultra-short-pulse fiber ring lasers, or in optical fiber communication links.
我们提出了一种使用渐变折射率多模光纤中的多模干涉将不同模场直径的两根单模光纤进行超低损耗耦合的方法。我们对干涉效应进行了详细分析，并表明渐变折射率光纤也可用作扩束器或聚光器。这些结果对于串联使用不同模场直径光纤的器件非常重要，例如在超短脉冲光纤环形激光器或光纤通信链路中。
